“Cellular Manufacturing” by Best Performing Consulting Organization Adding Value In Totality !!

ORIGINS FLANDERS’ PRODUCT ORIENTED DEPARTMENTS FOR STANDARIZED PRODUCTS WITH MINIMAL TRANSPORTATION (1925) SOKOLOVSKI/MITROFANOV: PARTS WITH SIMILAR FEATURES MANUFACTURED TOGETHER

BASIC PRINCIPLE SIMILAR “THINGS” SHOULD BE DONE SIMILARLY “THINGS “ PRODUCT DESIGN PROCESS PLANNING FABRICATION &ASSEMBLY PRODUCTION CONTROL ADMINISTRATIVE FUNCTIONS

TENETS OF GROUP TECHNOLOGY DIVIDE THE MANUFACTURING FACILITY INTO SMALL GROUPS OR CELLS OF MACHINES (1-5) THIS IS CALLED CELLULAR MANUFACTURING

SYMPTOMS FOR RE-LAYOUT Symptoms that allow us to detect the need for a re-layout: Congestion and bad utilization of space. Excessive stock in process at the facility. Long distances in the work flow process. Simultaneous bottle necks and workstations with idle time. Qualified workers carrying out too many simple operations. Labor anxiety and discomfort. Accidents at the facility. Difficulty in controlling operations and personnel.

What is Group Technology (GT)? GT is a theory of management based on the principle that similar things should be done similarly GT is the realization that many problems are similar, and that by grouping similar problems, a single solution can be found to a set of problems thus saving time and effort GT is a manufacturing philosophy in which similar parts are identified and grouped together to take advantage of their similarities in design and production

Implementing GT Where to implement GT? „Plants using traditional batch production and „process type layout „ If the parts can be grouped into part families „How to implement GT? „Identify part families „Rearrange production machines into machine cells

Types of Layout In most of today’s factories it is possible to divide all the made components into families and all the machines into groups, in such a way that all the parts in each family can be completely processed in one group only. The three main types of layout are: Line (product) Layout Functional Layout Group Layout

Line (product) Layout It involves the arrangements of machines in one line, depending on the sequence of operations. In product layout, if there is a more than one line of production, there are as many lines of machines. Line Layout is used at present in simple process industries, in continuous assembly, and for mass production of components required in very large quantities.

Functional Layout In Functional Layout, all machines of the same type are laid out together in the same section under the same foreman. Each foreman and his team of workers specialize in one process and work independently. This type of layout is based on process specialization.

Group Layout In Group Layout, each foreman and his team specialize in the production of one list of parts and co-operate in the completion of common task. This type of layouts based on component specialization.

The Difference between group and functional layout:

Evaluation criteria of Cell Design Evaluations of cell system design are incomplete unless they relate to the Cell Design. A few typical performance variables related to system operation are: Equipment utilization (high) Work-in-process inventory (low) Queue lengths at each workstation (short) Job throughput time (short) Job lateness (low)

Cell Formation Approach Machine - Component Group Analysis: Machine - Component Group Analysis is based on production flow analysis

Machine - Component Group Analysis Production flow analysis involves four stages: Stage 1: Machine classification. Machines are classified on the basis of operations that can be performed on them. A machine type number is assigned to machines capable of performing similar operations.

Production flow analysis involves four stages: Machine - Component Group Analysis Production flow analysis involves four stages: Stage 2: Checking parts list and production route information. For each part, information on the operations to be undertaken and the machines required to perform each of these operations is checked thoroughly.

Production flow analysis involves four stages: Machine - Component Group Analysis Production flow analysis involves four stages: Stage 3: Factory flow analysis. This involves a micro-level examination of flow of components through machines. This, in turn, allows the problem to be decomposed into a number of machine-component groups.

Production flow analysis involves four stages: Machine - Component Group Analysis Production flow analysis involves four stages: Stage 4: Machine-component group analysis. An intuitive manual method is suggested to manipulate the matrix to form cells. However, as the problem size becomes large, the manual approach does not work. Therefore, there is a need to develop analytical approaches to handle large problems systematically.

Machine - Component Group Analysis Example: Consider a problem of 4 machines and 6 parts. Try to group them. Components Machines 1 2 3 4 5 6 M1 M2 M3 M4

Machine - Component Group Analysis Solution Components Machines 2 4 6 1 3 5 M1 M2 M3 M4

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